like what style beat ali's slickness, or sugar ray leonards slickness if im right lol?

I can try to speak of a strategy. Most fast fighters have great speed but also have poor stamina. It's just the way most humans are made. Watch any high school track meet and you'll see that as incredible as black sprinters are-- blacks tend to rarely do well in the distance events. Fast fighters are ok if you let them set the pace. If you can put constant pressure on them they get tired much, much faster. Notice how fast fighters also tend to have low body fat-- that's because they have low energy reserves/body fat. That's why Mayweather struggled so mightily against Castillo's pressure but dealt so easily vs Mosely-- who's a much, much better fighter than Castillo. I'd instruct my fighter to constantly pressure and constantly shoot straight punches(which arrive faster than hooks-- minimizing the speed disadvantage, tire you less when you miss and don't leave you as open to the punches you tend to not see from a faster fighter) up the middle(head and body) and not open up too much with hooks until the opponent has slowed down.